# -*- coding: utf-8 -*-
"""
Created on Sun May  5 21:30:09 2019

@author: yaoyu
"""

import numpy as np
import matplotlib.pyplot as plt

np.random.seed(0)
mu, sigma = 100, 20
a = np.random.normal(mu, sigma, size=100)

plt.hist(a, 10, normed=1, histtype='stepfilled', facecolor='b', alpha=0.75)
plt.title('Histogram')

plt.show()